• Ellery Newcomer (9/9) Oct 16 2012 I am interfacing with some C code [python.dll], which has some structs
• Jacob Carlborg (6/15) Oct 16 2012 You need to declare the variable as "extern" if it's defined in the C co...
• Ellery Newcomer (2/5) Oct 17 2012 nice tip, but adding extern doesn't change link behavior at all.
• Jacob Carlborg (5/6) Oct 17 2012 Hmm, are you linking with the DLL (the import library) ? In not, you
• Regan Heath (5/9) Oct 18 2012 LoadLibrary[Ex]
• Ellery Newcomer (4/8) Oct 18 2012 I am using python27_digitalmars.lib, which is generated from
• Jacob Carlborg (9/12) Oct 18 2012 Ok. Do you know how the corresponding C code would look like? Maybe you
• Ellery Newcomer (5/15) Oct 18 2012 ha HA!
• Jacob Carlborg (4/7) Oct 18 2012 Hehe, high five :)

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

I am interfacing with some C code [python.dll], which has some structs 
declared like so:

PyTypeObject PyType_Type;

I wish to be able to link to PyType_Type like so:

extern(C) __gshared PyTypeObject PyType_Type;

in linux, I can do exactly that, but optlink is generating a new memory 
location for PyType_Type.

strings output suggests that my lib file contains the symbol PyType_Type.

Is this sort of thing supposed to work?

Jacob Carlborg <doob me.com> writes:

On 2012-10-17 07:07, Ellery Newcomer wrote:
 I am interfacing with some C code [python.dll], which has some structs
 declared like so:

 PyTypeObject PyType_Type;

 I wish to be able to link to PyType_Type like so:

 extern(C) __gshared PyTypeObject PyType_Type;

 in linux, I can do exactly that, but optlink is generating a new memory
 location for PyType_Type.

 strings output suggests that my lib file contains the symbol PyType_Type.

 Is this sort of thing supposed to work?

You need to declare the variable as "extern" if it's defined in the C code:

extern(C) extern __gshared PyTypeObject PyType_Type;

http://dlang.org/interfaceToC.html#C%20Globals

-- 
/Jacob Carlborg

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

On 10/16/2012 11:16 PM, Jacob Carlborg wrote:
 You need to declare the variable as "extern" if it's defined in the C code:

 extern(C) extern __gshared PyTypeObject PyType_Type;

 http://dlang.org/interfaceToC.html#C%20Globals

nice tip, but adding extern doesn't change link behavior at all.

Jacob Carlborg <doob me.com> writes:

On 2012-10-18 05:12, Ellery Newcomer wrote:

 nice tip, but adding extern doesn't change link behavior at all.

Hmm, are you linking with the DLL (the import library) ? In not, you 
need to use dlopen, or what the corresponding Windows function is.

-- 
/Jacob Carlborg

"Regan Heath" <regan netmail.co.nz> writes:

On Thu, 18 Oct 2012 07:41:16 +0100, Jacob Carlborg <doob me.com> wrote:

 On 2012-10-18 05:12, Ellery Newcomer wrote:

 nice tip, but adding extern doesn't change link behavior at all.

 Hmm, are you linking with the DLL (the import library) ? In not, you  
 need to use dlopen, or what the corresponding Windows function is.

LoadLibrary[Ex]

R


-- 
Using Opera's revolutionary email client: http://www.opera.com/mail/

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

On 10/17/2012 11:41 PM, Jacob Carlborg wrote:
 On 2012-10-18 05:12, Ellery Newcomer wrote:

 nice tip, but adding extern doesn't change link behavior at all.

 Hmm, are you linking with the DLL (the import library) ? In not, you
 need to use dlopen, or what the corresponding Windows function is.

I am using python27_digitalmars.lib, which is generated from 
libs\python27.lib with coffimplib, and it is linking my executables with 
python.dll.

Jacob Carlborg <doob me.com> writes:

On 2012-10-18 13:55, Ellery Newcomer wrote:

 I am using python27_digitalmars.lib, which is generated from
 libs\python27.lib with coffimplib, and it is linking my executables with
 python.dll.

Ok. Do you know how the corresponding C code would look like? Maybe you 
need to use the "export" attribute. It's the same as 
"__declspec(dllimport)", have a look:

http://dlang.org/htomodule.html

If that doesn't work then I'm out of suggestions, Windows is not my 
primary platform.

-- 
/Jacob Carlborg

Ellery Newcomer <ellery-newcomer utulsa.edu> writes:

On 10/18/2012 11:36 AM, Jacob Carlborg wrote:
 On 2012-10-18 13:55, Ellery Newcomer wrote:

 I am using python27_digitalmars.lib, which is generated from
 libs\python27.lib with coffimplib, and it is linking my executables with
 python.dll.

 Ok. Do you know how the corresponding C code would look like? Maybe you
 need to use the "export" attribute. It's the same as
 "__declspec(dllimport)", have a look:

 http://dlang.org/htomodule.html

 If that doesn't work then I'm out of suggestions, Windows is not my
 primary platform.

ha HA!

extern(C) extern export PyTypeObject PyType_Type;

seems to do the trick (I'm using a boiled down case just now)!

High five to the [non-me] non-windows dev!

Jacob Carlborg <doob me.com> writes:

On 2012-10-19 02:30, Ellery Newcomer wrote:

 extern(C) extern export PyTypeObject PyType_Type;

 seems to do the trick (I'm using a boiled down case just now)!

 High five to the [non-me] non-windows dev!

Hehe, high five :)

-- 
/Jacob Carlborg